I've made a couple of induction pickups like the ones in the first set of images in this discussion:
They seem to work well, but it's difficult to solder the parts together. I'm finding that I have to hold my soldering iron onto the thick copper wire and the prongs of the transformer for a surprisingly long time before I can get solder to melt onto them. I assume that the thick wire and the coil inside the transformer are acting as heat sinks. Even when I do get the solder to melt, it never seems to flow as easily as it does when soldering smaller wires and pots and the like, and the resulting joints are prone to breaking. Has anyone else had this problem? My soldering iron is a pretty cheap one from Radio Shack, so I wonder if it's a bit underpowered. Should I consider getting a nicer soldering iron, or is this just the nature of the beast?